Question

Write the following using C language for program in Arduino:

• Write a program that turns on first LED for one second, then first LED off, wait for one second, then second LED turns on for one second, then goes off, wait for one second, keep going for third and fourth LEDs, and the program repeats until power is cut or new program uploaded.

Answer 1

const int led1 = 2;
const int led2 = 3;
const int led3 = 4;
const int led4 = 5;

void setup() {
  
pinMode(led1,OUTPUT);
pinMode(led2,OUTPUT);
pinMode(led3,OUTPUT);
pinMode(led4,OUTPUT);

}

void loop() {
digitalWrite(led1, HIGH);   
delay(1000);   
digitalWrite(led1, LOW);
delay(1000);   
digitalWrite(led2, HIGH);   
delay(1000);   
digitalWrite(led2, LOW);
delay(1000);
digitalWrite(led3, HIGH);   
delay(1000);   
digitalWrite(led3, LOW);
delay(1000);
digitalWrite(led4, HIGH);   
delay(1000);   
digitalWrite(led4, LOW);
delay(1000);   
}